Synthesis and solid-state NMR structural characterization of polysiloxane-immobilized amine ligands and their metal complexes

Yang, J. J.; El‐Nahhal, Issa M.; Chuang, I-Ssuer; Maciel, Gary E.

doi:10.1016/s0022-3093(96)00534-0

Cited by 104 publications

(72 citation statements)

References 54 publications

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“…2). Use of APS samples under their protonated form was preferred over the unprotonated amine function (even if Hg II is liable to form immobilized complexes on silica materials grafted with amine groups [8]), because APS are much more stable in acidic medium than at higher pH where base-catalyzed solubilization of the material is known to occur [53,54].…”

Section: Access Rate To the Binding Sites ± Influence Of Speciationmentioning

confidence: 99%

Grafted Silicas in Electroanalysis: Amorphous Versus Ordered Mesoporous Materials

et al. 2003

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This work reports the enhanced response of electrodes modified with ordered mesoporous silica-based materials, as compared to corresponding amorphous materials, in case of open-circuit accumulation and voltammetric detection of a target analyte. Several porous silica samples grafted with either thiol or ammonium groups, displaying high surface areas with various structural characteristics and different pore sizes, have been examined with respect to their ability to concentrate Hg II species. Better accessibility to the binding sites and faster diffusion processes in the interior of grafted silicas have been observed for the ordered samples prepared by micelle-templating because they contain channels of regular size, which are less tortuous than the irregular pore systems in amorphous materials. When applied in electrochemical detection of Hg II after preconcentration, the ordered solids gave rise to voltammetric signals higher by more than one order of magnitude in comparison to the amorphous organically-modified silicas. This rather new class of materials, which can be easily produced as ordered organic-inorganic hybrids, is expected to improve the performance of silica-modified electrodes in various fields of electroanalysis.

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Section: Access Rate To the Binding Sites ± Influence Of Speciationmentioning

confidence: 99%

Grafted Silicas in Electroanalysis: Amorphous Versus Ordered Mesoporous Materials

et al. 2003

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“…At 1100 cm -1 is shown an asymmetric stretching vibrations relative to Si-O-Si (δSi-O-Si) that corresponds the skeleton of 3-aminopropril silica gel is shown at 1100 cm -1 , such as the absorption at 480 cm -1 which is related to the bond O-Si-O (δO-Si-O) Yang et al, 1997). Figure 1-B show the absorption spectrum in the infrared region of SiCoNP.…”

Section: Resultsmentioning

confidence: 96%

“…Figure 1 show the vibrational spectrum in the infrared region of 3-aminopropyl silica gel (Si) and of cobalt pentacyanonitrosylferrate adsorbed on the 3-aminopropril silica gel surface (SiCoNP). A broad strong absorption at 3448 cm -1 corresponding to the axial deformation of the νsOH group was observed Yang, El-Nahhal, Chuang, & Maciel, 1997).…”

Section: Electrochemical Measurementsmentioning

confidence: 99%

Electrocatalitic Detection of Hydrazine Using Chemically Modified Electrodes with Cobalt Pentacyanonitrosylferrate Adsorbed on the 3–Aminopropylsilica Surface

Sá¹,

Maraldi²,

Bonfim³

et al. 2017

IJC

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Cobalt pentacyanonitrosylferrate on the aminopropylsilica silica gel surface (SiCoNP) was previously prepared following two steps. The electrochemical behavior of SiCoNP modified electrode showed two redox couples, the first and second redox couples were observed at anodic potential (Epa) 1 = 0.36 and 0.60 V vs. Ag/AgCl attributed to the oxidation of Co (II) to Co (III) and Fe (II) (CN) 5 NO/Fe (III) (CN) 5 NO, respectively. The modified carbon paste electrode with SiCoNP was tested in the hydrazine electrooxidation. In the hydrazine electrooxidation, the H + release was observed and the two metal centers are involved in this process. The proposed mechanism has been described and based on studies of the effect of hydrogen ion concentration in the redox process of bivalent compound formed. Thus a large increase in hydrogen ion concentration promotes the formation of an intermediate electroactive species with an anodic peak at 0.56 V. The nature of this species is not well established but may be related to protonation of cyanide or NO groups present. The modified graphite paste electrode presented a limit of detection of 2.38×10 -4 mol L -1 and amperometric sensitivity of 1.37×10 -6 A.mol -1 .L.

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“…29 and the organofunctional groups, 30 no significant changes are observed for the cellulose acetate 13 C NMR, indicating that the aluminum oxide and the organic groups attached on the matrix surface interact weakly with the cellulose acetate groups.…”

Section: Organofunctionalization Of Cella/al 2 Omentioning

confidence: 91%

Nitrogen Containing Organosilicon Bonded an Al2O3-Cellulose Acetate Hybrid Material: Preparation, Characterization and Use for Adsorption of Fe(III), Cu(II) and Zn(II) from Ethanol Solutions

Lazarin¹,

Gushikem²

2002

J. Braz. Chem. Soc.

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Synthesis and solid-state NMR structural characterization of polysiloxane-immobilized amine ligands and their metal complexes

Cited by 104 publications

References 54 publications

Grafted Silicas in Electroanalysis: Amorphous Versus Ordered Mesoporous Materials

Grafted Silicas in Electroanalysis: Amorphous Versus Ordered Mesoporous Materials

Electrocatalitic Detection of Hydrazine Using Chemically Modified Electrodes with Cobalt Pentacyanonitrosylferrate Adsorbed on the 3–Aminopropylsilica Surface

Nitrogen Containing Organosilicon Bonded an Al2O3-Cellulose Acetate Hybrid Material: Preparation, Characterization and Use for Adsorption of Fe(III), Cu(II) and Zn(II) from Ethanol Solutions

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